By Nathan Hondros

7 September 2018 — 2:52pm

Liberal MP Andrew Hastie has lent his support to workers striking in his electorate south of Perth, telling an applauding Australian Workers Union demonstration he backs their industrial campaign despite being from a "different tribe".

In a rare move for a conservative politician, Mr Hastie took to the back of a truck to speak to unionists, who have been striking for 31 days over redundancy provisions and minimum staffing levels in a new EBA with resources giant Alcoa.

He told the workers from the union once led by Labor leader Bill Shorten that successive governments had failed in developing energy policy and took a shot at the Turnbull Government's attempts to legislate the Paris Agreement on reducing carbon emmissions.

Liberal MP Andrew Hastie addresses striking AWU workers in his electorate of Canning, south of Perth.

Photo: Supplied

"We've rushed to renewables, we've made power expensive, not just for industry but for working families and seniors and you guys have paid the price with people trying to negotiate down your pay and conditions," he said.

"That's why I objected to legislating Paris, because I think we should put Australian workers and families and seniors first, we shouldn't be second.

"There is a real problem in this country and it's my view that jobs on the west coast are subsidising those on the east coast because we've made an absolute shocker of energy policy over the last few decades."

The protest was held outside Mr Hastie's office in Mandurah, south of Perth, and came in the same week Prime Minister Scott Morrison threatened to deregister the CFMEU, and flagged a tougher government approach to union behaviour ahead of the election.

Mr Hastie said he met the AWU's WA president Andy Hacking, who he described as a gentleman, and promised to take up the cause of the striking workers with Alcoa management.

"I know as well a lot of you have sacrificed income, a lot of you have got families, a lot of you have got mortgages, a lot of you have got school fees," Mr Hastie told the workers.

"A lot of you have got things you need to take care of and you've taken a hit and I know how committed you are."

Mr Hastie is not the only politician lending support for the striking workers.

In August, unionists and Alcoa employees were joined by state Labor minister, including Deputy Premier Roger Cook and Industrial Relations Minister Bill Johnston, at a demonstration outside outside Parliament House.

Premier Mark McGowan had also visited striking workers at a picket line outside Alcoa's Kwinana refinery.

Alcoa employees had voted rejected the latest EBA proposal and had vowed to continue industrial action.

A spokeswoman from Alcoa said the company was concerned about the impact the industrial action was having on its workers.

"We invite them back to work so they can restore their livelihoods while we work to bring this matter to a resolution," she said.